Water-insoluble monoazo dyestuffs



Patented Mar. 31, 1970 WATER-INSOLUBLE MbNOAZO DYESTUFFS Helmut Gies, Hofheim, Taunus, Germany, assignor to Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius & Bruning, Frankfurt am Main, Germany, a

corporation of Germany No Drawing. Filed July 13, 1966, Ser. No. 564,757

Claims priority, applicatioi Germany, July 23, 1965,

,701 Int. Cl. C07c 107/06; C09b 29/26 US. Cl. 260-205 6 Claims ABSTRACT OF THE DISCLOSURE A water-insoluble monoazo dyestuff of the formula monochlorinated lower alkenyl, monobrominated lower alkenyl, lower alkylene-sO -lower alkyl or lower alkyleneCOO-phenyl and R represents hydrogen or lower alkyl.

The present invention provides Water-insoluble monoazo dyestuffs and a process for preparing them; it provide in particular Water-insoluble monoazo dyestuffs of the general formula wherein R represents a hydrogen atom or an alkyl or alkenyl group which may be substituted, R represents a hydrogen atom or a low molecular alkyl group, Z stands for a negative substituent which does not impart solubility in water and the benzene nuclei A and B may contain further substituents which do not impart solubility in water.

Now we have found that water insoluble monoazo dyestuffs of the general Formula 1 R1 l on Z- A N=N B N -R2 C-hal CHz- I (1) wherein R represents a hydrogen atom or an alkyl or alkenyl group which may be substituted, R represents a hydrogen atom or a low molecular alkyl group, Z stands for a negative substituent which does not impart solubility in water and the benzene nuclei A and B may contain further substituents which do not impart solubility in water, can be obtained by coupling in an acid medium the diazonium compound of an amine of the benzene series, which carries in 4-position a negative substituent not imparting solubility in water and which may contain on the benzene nucleus further substituents not imparting solubility in water, in 4-position with an amine of the general Formula 2 \CH2 1 a wherein R and R have the meanings given above and the benzene nucleus B may contain further substituents not imparting solubility in water.

As amines from which the diazonium compounds to be used are derived, and which contain in 4-position a negative substituent which does not impart solubility in water, there may be used such aminobenzene derivatives which contain in 4-position for example a halogen atom or a nitro, nitrile, trifluoromethyl or carboxylic acid ester group and which, moreover, carry on the benzene nucleus further groups not imparting solubility in water, for example, halogen atoms, nitro, nitrile, trifluoromethyl, carboxylic acid ester or alkoxy groups.

The amines of the general Formula 2 mentioned above being employed as coupling components may carry on the benzene nucleus B groups not imparting solubility in water, for example, halogen atoms, alkyl, trifluoromethyl, alkoxy or acylamino groups.

The alkyl or alkenyl groups which in addition to hydrogen may stand for R may for example 'be substituted by halogen atoms or hydroxyl or nitrile groups or by the groupings O-.alkyl, Oacyl, for example The coupling is effected in an acid medium, if necessary, in the presence of acid-binding agents, for example, sodium acetate or magnesium oxide. The dyestulfs o'btainable by this method are worked up in the usual manner withdispersing agents to dyeing preparations, which yield on materials made of polyester, triacetate and 2 /2- acetate fibres dyeings of excellent fastness properties. These dyeings are superior to dyeings produced by dyestuffs which carry instead of the group an unsubstituted alkyl group on the nitrogen atom, in so far as they show a better fastness to thermofixation and light without being inferior, however, as regards their building up properties. Compared to dyestulls which do not carry a halogen atom on the double linkage of an alkenyl group, the above dyestuffs have a higher ability to resist wool and are less sensitive to a change of the pH-value. For the dyeing of polyestermaterials the new dyestutfs are advantageously used in the form of the above-mentioned dyeing preparations, which are then applied in aqueous suspension at temperatures superior to C. under pressure or at approximately 100 C. while adding the usual carriers.

The new dyestuffs form on materials made of polyethylene terephthalate fibres yellow, orange, red, brown and blue dyeings having excellent fastness properties.

The following examples serve to illustrate the invention.

EXAMPLE 1 196.5 parts by weight of 2,4,6-trichloro-l-aminobenzene are diazotised in the usual manner and the diazo solution obtained is slowly added to a solution of 256 parts by weight of N-(hydroxyethyl)-N-(,8-bromallyl) -aniline in 1500 parts by weight of hydrochloric acid of 36% strength. After one hour the reaction mixture is diluted with water to 1500 parts by volume and after 24 hours the dyestuff which has separated is filtered and dried. It is an orange crystalline powder which in its dispersed form dyes a tissue made of polyethylene terephthalate fibres in the presence of o-phenyl-phenol as carrier at 100 C. deep,'golden yellow shades. The dyeings obtained have good fastness to light and subliming.

It is also possible to use other carriers instead of the o-phenyl-phenol mentioned above, for example diphenyl, chlorobenzene and 2 hydroxytoluene 3 carboxylic acid ester.

thermosol-method. The yellowish red dyeings obtained have very good fastness to light and subliming.

The following table lists further water-insoluble monoazo dyestulfs obtainable according to Examples 1 to 3. Their structure corresponds to the general formula 1 CH2-OX1=OX2Rg and they are characterized in the following table by the radicals R, R R X X Y and Z and by the shades produced on materials of polyethylene terephthalate fibres.

ShIade ton no es er Example R R R; X X; Z Y fibr e s 4 2-cyano-4-nitropheny1 C H4OH CH3 H 01 H H Bluish red. 5 do C2H4ON OH; H 01 H H Yellowish red.

H H Br H H H Red.

H Br H H H Bluish red. H Cl H H H Do. H H Cl H H Do. H 01 H H H Yellowish red.

H Br H H H Red. H 01 H H H Red.

H Br H H H Bluish red. H Br H H H Violet. H do CzH4N-SOzCH3 H Br H H H Bluisll red.

(D CzH40-OCH3 H B! H H H Red. CzHrON H B! H H H Yellowish red. C2H ON H Br H H OH; Bluish red. 0.. O H CN H Br H H 01 Red. 2-cyano-4-nitrophenyl H H Br H H NH-COOOH3 Bluish red. 21 6-chl0ro-2,4-dinitrophenyl H H Br H OCzHs NHOOOCI'IH Blue. 22 2-cyano-4-nitrophenyl H H Br H OOH 01 Red. 23 4-cyano-2-n1trophenyl H H Br H H NHOOOCH; Yellowish red. 24.-. 2-cyaono-4-nitrophenyl C2H4CN H Br H H H Orange. 25 4-nifiro-2icarbomethoxy- CaHaCOOCHs H Br H H H Do.

p eny 26 2-nittlro-4-trlfluoromethyl- CzH4OH H Br H H H Do.

en 4-11itro-2-chloro-3-hydroxy- CzH4OH H Br H H H Red.

ethoxyphenyl. 4-nitrophenyl CHnCBP=CH2 H B1 H H NHCOOCH Red. 29 2-ngro-4iearbomethoxy- H H Br H H NHCOCH; Orange.

p eny 30 4-nitro-2-n1ethyl-phenyl. OH -CH=(|3CH3 H Br H H 11 D EXAMPLE 2 I claim: 207 parts by weight of 2,6-dichloro-4-nitro-1-a-minoben- 1. A water-insoluble monoazo-dyestufi of the formula zene are diazotised in the well known manner. The diazo Y1 solution thus obtained is slowly added to 211.5 parts by /Ri E weight of N- (hydroxyethyl)-N (,8 chloroallyl) aniline 1| 412 while thoroughly stirring. After one hour the reaction mix- R ture is diluted 10,000 parts by volume of water. After 3 hours the pH-value is adjusted to 3 by means of sodium hydroxide solution and after another 12 hours the dyestuif which has separated is filtered and dried. It is a dark brown powder which in its dispersed form dyes materials made of polyethylene terephthalate fibres at 120 C. yellow-brown shades. The dyeing obtained has very good fastness to light and subliming.

EXAMPLE 3 163 parts by weight of 2-cyano-4-nitroaniline are diazotised in the usual manner whereupon 265 parts by weight of N-(cyanoethyl)-N-(fi-bromallyD-aniline are dropped into the diazo solution obtained, while thoroughly stirring.

Br Cl R represents hydrogen or methyl, and R represents ch10- rine or bromine.

2. The water-insoluble monoazo dyestuif of the formula 3 The Water-insoluble monoazo dyestuff of the formula 4. The water-insolbule monoazo dyestufi of the formula CHrCH CN CHr-C BFCH:

OHrOBr=OH2 6 5. The water-insoluble monoazo dyestufi of the formula.

C Hz-C H: O H 01 6. The water-insoluble monoazo dyestuif of the formula CHrCH=C-CHa References Cited UNITED STATES PATENTS 12/1947 Dickey et a1 2602075 3/ 1964 Brugger et a1 260-205 

